3 History has given several hints of alien civilizations on earth
Discovery channel’s curiosity series advisor Dr. Kaku feels that given the advanced technology that aliens may possess, earth wouldn’t stand a chance against and alien invasion and would be wiped out in seconds.
Friend or foe, only time will tell. In the meanwhile there has been proof suggestive of the fact that aliens have indeed visited earth and lived here as ancient and advanced civilizations. Although no concrete evidence exists as yet, there have been innumerous hints in the form of texts, cave art, artifacts and ruins that are suggestive of the same. If you still don’t believe in UFO’s and think aliens don’t exist, then watch the video which may change your mind.